MOF-Derived Ni1-xCox@Carbon with Tunable Nano-Microstructure as Lightweight and Highly Efficient Electromagnetic Wave Absorber  

作　　者：Lei Wang Mengqiu Huang Xuefeng Yu Wenbin You Jie Zhang Xianhu Liu Min Wang Renchao Che 

机构地区：[1]Laboratory of Advanced Materials,Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials(iChem),Fudan University,Shanghai 200438,People’s Republic of China [2]Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou 450002,People’s Republic of China

出　　处：《Nano-Micro Letters》2020年第11期90-106,共17页纳微快报（英文版）

基　　金：supported by the Ministry of Science and Technology of China (973 Project No. 2018YFA0209102);the National Natural Science Foundation of China (11727807, 51725101, 51672050, 61790581);Science and Technology Commission of Shanghai Municipality (16DZ2260600)。

摘　　要：Intrinsic electric-magnetic property and special nano-micro architecture of functional materials have a significant effect on its electromagnetic wave energy conversion,especially in the microwave absorption(MA) field.Herein,porous Ni1-xCox@Carbon composites derived from metal-organic framework(MOF)were successfully synthesized via solvothermal reaction and subsequent annealing treatments.Benefiting from the coordination,carbonized bimetallic Ni-Co-MOF maintained its initial skeleton and transformed into magnetic-carbon composites with tunable nano-micro structure.During the thermal decomposition,generated magnetic particles/clusters acted as a catalyst to promote the carbon sp^2 arrangement,forming special core-shell architecture.Therefore,pure Ni@C microspheres displayed strong MA behaviors than other Ni1-xCox@Carbon composites.Surprisingly,magnetic-dielectric Ni@C composites possessed the strongest reflection loss value-59.5 dB and the effective absorption frequency covered as wide as 4.7 GHz.Meanwhile,the MA capacity also can be boosted by adjusting the absorber content from 25% to 40%.Magnetic-dielectric synergy effect of MOF-derived Ni1-xCox@Carbon microspheres was confirmed by the off-axis electron holography technology making a thorough inquiry in the MA mechanism.

关 键 词：Metal-organic frameworks POLARIZATION Magnetic coupling Microwave absorption Electromagnetic parameters 

分 类 号：TB383.1[一般工业技术—材料科学与工程]